Door-operating mechanism.



E. PEHRSON.

DOOR OPERATING MEGHANISM.

APPLICATION FILED JULY 13, 1912.

1,087,820., Patented Feb. 17, 1914.

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lflrlTED STATES ATENT OFFICE.

ELOF PEHRSON, 0F LETHBRIDGE, ALBERTA., CANADA.

DOOR-OPERATING MECHANISM.

Appneanon fusa July is, 1era.

To all whom it may concern Be it known that l, Fnor Pnnnsoii, a subjectof the King o-f Great Britain, residing at Lethbridge, in the Provinceof Alberta and Dominion of Canada, have invented new and usefulImprovements in Door0p erating Mechanism, of which the following is aspecification.

This invention relates to improvements in furnace doorsl and especiallywith reference to means for opening furnace doorsso as to avoid thenecessity of putting down a shovel, loaded with coal, before opening afurnace door preparatory to throwing the coal in the furnace, the objectof the invention being to provide an improved furnace door operatingmeans of this character which is extremely cheap and simple, is strongand durable, is not likely to get out of order and which may beinstalled on any furnace of ordinary construction.

r1`he invention consists in the construction,

combination and arrangement of devices hereinafter described andclaimed.

1n the accompanying drawing:-ll`ignre 1 is an end elevation of a portionof a furnace provided with doors and door operating devices constructedin accordance with my invention. Fig. 2 is a horizontal sectional viewof the same on the plane indicated by the line oma of Fig. 1, showing`the door closed in full lines and open in dotted lines.

For the purposes of this specification, a portion of the front end orcasing of a furnace is indicated at 1, the door opening being indicatedat 2 and the ash door being indicated at 3. A door frame et is bolted orotherwise secured on the front side of the wall 1 and extends around thedoor opening :2. On this frame is the lower door 5 andthe upper door Gwhich are respectively provided at one end with hinges 7 8. Each door ispro-vided in its opposite A ennd and preferably near its upper side witha russi). Latches 10, to engage the inner side of the' door frame l areprovided with stems 11 which are pivotally mounted in openings withwhich the furnace doors are provided and at the outer ends of the saidstems are operating arms 12 which project from the free ends of thefurnace doors, the inner ends of the said operating arms be ing mountedin the recess 10 and bearing on the bottom of said recess. Each stem 11is Specification of'letters Patent.

Patented Feb. 117, 1914.

serial no. 709,181.

provided with a shoulder 13 which engages the inner side of one of thefurnace doors.

An eye bolt 111 projects from the outer side of each furnace door, nearthe hinged end thereof and springs 15, which are connected to thefurnace wall or front 1, as at 16 are connected also to the said eyebolts 141, the said springs acting to open the furnace doors.

then the doors are closed, they are held in closed position by thegravitating action of the operating arms 12 of the latches, the saidoperating arms normally holding the latches engaged with the inner sideof the door frame 4f. A vertically movable operating bar 17 is mountedin guides 18 on the outer side of the door frame at and near the freeends of the doors 5 6. This operating bar is provided with a series ofopenings 19 and is also provided with tappet pins 2O which may be placedand are adjustable in the said openings and are so arranged as to bearrespectively under t-he lower sides of the operating arms 12 of thelatches. pedal 21 is provided with a vertical arm which is arranged tooperate in a guide 23. A lever 241- is pivotally mounted as at 25, hasone end pivotally connected as at 26 to the upper end of the pedal armand has its opposite end connected pivotally as at 27 to the lower endof the operating bar 17. The weight of said operating bar is such thatitis normally in lowered position, shown in Fig. 1, and with its tappetpins just below the operating arms 12, the pedal being held normally inelevated position. The doors are normally closed as shown in Fig. 1 andalso as shown in full lines in Fig. 2. ln order to open the doors, it isonly necessary to place one foot on the pedal 21 and depress the same,thus causing the lever 24 to raise the operating bar 17. The upwardmovement of the operating bar causes its tappet pins lo engage the lowersides of the operating arms 12 to raise the outer ends of said operatingarms, t-hus causing the stems of the latches to turn so that the latchesdisengage the inner side of the door frame at and, hence, the furnace15, when the doors are thus released, operate to open the doors, asindicated in dotted lines in Fig. 2. This renders it unnecessary for theperson who attends the furnace to place a shovel loaded with coal on thefloor before opening the furnace door. If it is desired that only one ofthe furnace doors shall be opened by the operating mechanism, the tappetpin which operates the latch arm of the other door can be removed fromthe operating bar 17.

Vhile I have herein shown and described a preferred form of myinvention, I Would have it understood that changes may be made in theform, proportion and construction of the several parts, Withoutdeparting from the spiritof the invent-ion and Within the scope of theappended claims.

I claim l. A furnace Wall having a door opening, a door frame on theWall and having a door opening of less length than that of the openingin the Wall so that one end of the door frame projects inwardly in andpartly covers the opening in the Wall, a door hinged at the other end ofthe frame, and a latch on the inner side of the door at its free end7arranged to engage the inner side of the said projecting end of the doorframe, and said latch having a stem extending through and pivotallymounted in an opening in the door, and an operating arm at the outer endof said stem acting by gravity to hold the latch in fastened position.

2. A furnace having a door frame, a door hinged at one end of the doorframe., a latch 30 carried by the other end of the door, adapted toengage the corresponding inner side of the door frame when the door isin closed position and having a stem pivotally mounted in the door andan operating arm 35 at the outer end of the said stem on the outer sideof the door, said operating` arm acting by gravity to normally hold thelatch in fastened position, a vertically movable opw erating bar mountedon the front side of 40 the door frame and having a tappet pin movablewith said bar to engage and actuate the latch arm7 said tappet pin beingbelow the latch arm When the bar is in normal depressed position, alever mounted on the 45 IV. S. BALL.

Copies of this patent may be obtained for tive cents each, by addressingthe Commissioner of Patents. Washington, D. C.

